Question

Which propulsion system is most suitable for high-speed supersonic aircraft?

• A. Turboprop
• B. Turbojet
• C. Turbofan
• D. Ramjet
• E. Piston Engine

Hint:

Propulsion Efficiency Rank:
Low Speed: Turboprop
Subsonic/Transonic: Turbofan
Supersonic: Turbojet
Hypersonic: Ramjet/Scramjet

Answer 1

The Correct Option is B

The question asks which propulsion system is most suitable for high-speed supersonic aircraft. Let us evaluate each option:

• Turboprop: Turboprop engines are efficient at lower speeds and altitudes, primarily used in subsonic aircraft. They are not suitable for supersonic speeds because their propeller efficiency decreases significantly at high speeds.
• Turbojet: Turbojet engines are designed for high-speed performance and are most efficient at supersonic speeds. They are simple in design compared to turbofans and are optimized for high-speed travel due to their ability to handle the increased air intake and high-temperature exhaust efficiently.
• Turbofan: While turbofans can operate at supersonic speeds, they are optimized for a mix of subsonic and supersonic speeds. The bypass air enhances thrust for subsonic flight but is less efficient for sustained high-speed supersonic travel compared to turbojets.
• Ramjet: Ramjets are designed for very high-speed travel, typically above Mach 3, but they require an initial speed to operate because they lack a turbine to compress air. Hence, they are not practical for all-around supersonic aircraft propulsion without assistance from another engine type for takeoff and low-speed operation.
• Piston Engine: Piston engines are used in propeller-driven aircraft and are not suitable for supersonic speeds due to their mechanical limitations and inefficiency at high altitudes.

Based on the evaluation, the most suitable engine for high-speed supersonic aircraft is the Turbojet engine because of its ability to efficiently handle high-speed, high-altitude flight conditions. Therefore, the correct answer is:

Turbojet